A shortcut key can include a Shift or Alt Key in combination with a key. Click the + sign in the Shortcut column to specify a shortcut key. After adding the key, associate it with a string or a sequence of X Keysyms.
Select Send string and type in a string that should be sent when the specified shortcut key is pressed.
Select Send X Keysyms and then click the + sign next to the X Keysyms to send column to open the Select X Keysym dialog box. Select the X Keysym you want to send and click OK. Continue to click + until you have added the entire X Keysym sequence for the shortcut.